Please
select a letter for terms starting with that letter:
A
| B | C
| D | E
| F | G
| H | I
| J | K
| L | M
| N | O
| P | Q
| R | S
| T | U
| V | W
| X | Y
| Z
-
U -
UHP
Acronym for Ultra High Performance and/or Ultra High
Efficiency; a term typically used with metal halide
lamps that power ultra-bright projectors.
Uniform
Brightness
Across a lighted surface, uniform brightness refers
to the lack of brighter or dimmer areas of a projected
image.
USB
Acronym for Universal Serial Bus; a peripheral connection
interface for low-speed devices notable for it's hot-swap
ability.
UHF
Acronym for Ultra High Frequency.
Ultra
High Frequency
Television broadcast frequency range between 300 and
3000 MHz, on channels 14 through 83. Also the name for
a type of connector used for video cables.
Ultraviolet
Light/heat rays that have a shorter wavelength (and
higher frequency) than those in the visible spectrum.
Ordinarily filtered or blocked to prevent eye damage
and dye fading.
Underscan
A decreasing of the raster size (H & V) so that
all four edges of the picture are visible on the screen.
Underscanning allows viewing of skew and tracking which
would not be visible in normal (overscanned) mode. It
is also helpful when aligning test charts to be certain
they touch all four corners of the raster. Likewise,
when checking the alignment of multiplexer images from
a film chain, underscan allows proper framing of the
projected image going into the video camera.
Unix
A widely accepted multi-user computer operating system
developed by AT&T.
Uninterruptible
Power Supply
A power supply that continues to provide voltage for
a limited time after the main power is off (fails).
Universal
Serial Bus
Announced by Intel, IBM, Compaq, Digital, NEC and Northern
Telecom, the USB is a bus designed to handle up to 127
external computer devices with a transfer rate of 12
megabits per second. A true plug-and-play bus, it allows
for devices to be attached/detached without removing
power. It is initially intended for keyboard, mouse,
printer, etc. Although it cannot carry video signals,
some monitors will have USB plugs to act as a USB hub
for connecting other devices.
UPS
Acronym for Uninterruptible Power Supply.
USB
Acronym for Universal Serial Bus.
User
Term used to describe the operator or user of a computer
program or system.
User
Interface
The software that allows communication between the computer
user and the computer.
UV
Acronym for Ultraviolet.
[back
to top]
|
